JP3151561B2 - Photographic lens barrel device for camera with lens barrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a lens barrier widely used in video cameras used in various fields, in addition to a conventional camera using a photosensitive film or a so-called electronic camera using a CCD. The present invention relates to an improvement of a taking lens barrel device.

[0002]

2. Description of the Related Art Recently, instead of a detachable lens cap, a camera provided with a lens barrier on a front portion of a photographing lens barrel has been frequently used, and various techniques relating to this have been disclosed.

For example, Japanese Unexamined Patent Publication No.
Japanese Patent Application Laid-Open No. 199332 discloses a photographic lens barrel device in which a variable barrier lens type camera performs opening and closing operations of a lens barrier in relation to opening and closing operations of a finder barrier.

[0004] This photographing lens barrel device basically has
It comprises a lens barrel that moves to the film side when realizing the first focal length of the taking lens and moves to the subject side when realizing the second focal length, a finder barrier composed of a plate-like member, and two blade members. A lens barrier, a cam member having a cam surface inclined with respect to the optical axis direction and moving in a predetermined direction in conjunction with the finder barrier, and a finder when the lens barrel is in a state of realizing the first focal length. The lens barrier can be moved to its closed position in conjunction with the operation of moving the barrier to its closed position, while the lens barrier can be moved to its open position in conjunction with the operation of moving the finder barrier to its open position. First driving means;
When the finder barrier is in the closed position, the lens barrel is retracted to the film side, while at least when the lens barrel is on the side achieving the second focal length, the lens barrier cooperates with the cam surface of the cam member. When the lens barrier is opened, the finder barrier placed in the non-photographing state (closed state) is moved rightward to move the cam member. When operating to move the lens barrier upward and closing the lens barrier, first, the finder barrier is moved to the left to move the cam member downward. Then, the second driving means shifts the photographing lens barrel device from the wide photographing state to the telephoto photographing state, drives the lens barrel to the film side, and closes the lens barrier using the operation of this lens barrel. I have.

That is, in this photographing lens barrel device,
Move the viewfinder barrier to the right from the non-shooting state,
By operating the lens barrier to rotate to the open position by the urging force of the tension spring applied to the lens barrier itself, the front of the taking lens is opened, and
From the telephoto state, the finder barrier is moved to the left to move the lens barrel to the film side, and during this movement, the lens barrier is turned to the closed position against the urging force of the tension spring. And the front of the taking lens is closed.

Japanese Unexamined Patent Publication (Kokai) No. 63-239430 discloses that a drive system from a motor as a drive source to a movable lens barrel (photographing lens) is divided into two parts using two gears, and one of the two branches is driven. A sliding clutch mechanism that drives the movable barrel with the system and opens and closes the lens barrier with the other branch drive system, and further uses a friction spring in the branch drive system that drives the movable barrel. After the movable lens barrel is stopped at a predetermined position (a position in contact with the protrusion) with the interposition of a lens barrel, a technique of opening and closing the lens barrier by the operation of the sliding clutch mechanism is disclosed.

[0007]

However, in the technique disclosed in Japanese Patent Application Laid-Open No. 63-199332, the operation of moving the finder barrier to the right and left is used as a drive source for opening and closing the lens barrier. Therefore, an interlocking mechanism from the finder barrier to the cam member and a member such as a spring for returning the cam member to the free state position are required, and this increase in parts is disadvantageous in terms of space and cost. Was the cause of

According to the technique disclosed in Japanese Patent Application Laid-Open No. 63-239430, the operation of stopping the movable lens barrel at a predetermined position and the operation of opening and closing the lens barrier are chronologically connected in series, and the entire operation time is reduced. In addition to making the lens length longer, when the operation of the slip clutch mechanism becomes uncertain, there is a possibility that the drive system of the photographing lens may be damaged.

As one of the means for opening and closing the lens barrier, a member for directly holding the photographing lens, for example, a lens barrier opening and closing means for opening and closing the lens barrier using a lens holding frame member can be considered. In general, the member that directly holds the taking lens is not made so strong in terms of strength, and is a member that requires optically delicate precision. Performing the opening / closing operation of the lens barrier may cause a significant disadvantage in maintaining accuracy.

As described above, the conventional technology has problems that the opening / closing structure of the lens barrier is complicated, disadvantageous in maintaining accuracy, and further, adversely affects the driving system of the photographing lens. Therefore, the emergence of such an improvement was strongly desired.

The present invention has been made in view of such circumstances, and has a plurality of partial lens barrels as compared with a conventional device of this type.
The drive mechanism is easy fabrication thereof simplified, the length of time extension
Despite being large , storage time is significantly reduced
It can, configured as the number of parts does not cause problems with less and maintain accuracy surface robust, yet, shoot camera having a lens barrier new structures do not adversely affect the drive system of the taking lens It is an object to provide a lens barrel device.

[0012]

SUMMARY OF THE INVENTION In the present invention, an object of the present invention is to provide a photographing optical system including a first lens group and a second lens group disposed so as to be relatively movable along the same optical axis. And are provided movably relative to each other along the optical axis,
At least in a non-photographing state, one of the partial barrels is configured to be housed in the internal space of the other partial barrel.
Of the two partial barrels, a first partial barrel located at the forefront and configured to be able to fixedly hold at least the first lens group of the imaging optical system, and of the two partial barrels, A second partial lens barrel provided between the first partial lens barrel and the lens barrel main body and provided so as to be housed in the internal space of the lens barrel main body at least in a non-photographing state; Supporting the first and second partial lens barrels so as to be relatively movable along the optical axis, and storing the first and second partial lens barrels in their own internal space at least in a non-photographing state. said barrel body portion configured to obtain the
The first part is provided so as to be relatively movable along the optical axis in the lens barrel.
Is, the second lens group that fixedly holds the second lens group
A holding frame, between the lens barrel main body and the second partial lens barrel
First lead screw provided and first lead screwed to this
Consists of a nut gear and receives the rotational driving force of the first motor
The first lead nut gear is driven forward by the lead propulsion action.
Move the second partial barrel in the optical axis direction with respect to the barrel body
A first driving mechanism , the second partial barrel, and the first part
Second lead screw provided between the lens barrel and the screw
And a second lead nut gear,
The lead of the second lead nut gear receiving a rotational driving force
The first part is moved by the propulsion action with respect to the second part barrel.
Move the lens barrel simultaneously in the same direction as the second partial lens barrel
A second drive mechanism , the first partial barrel, and the second lens group
The third lead screw and lead nut provided between
Li such a preparative, the third to receive a rotational driving force of the second motor
The first partial barrel is formed by a lead propulsion action of a lead screw.
Move the second lens group holding frame in the optical axis direction with respect to
A third drive mechanism , an openable / closeable lens barrier means provided in the first partial lens barrel and configured to shield a space on the object field side of the first lens group from the outside; The lens barrier of the lens barrier means is provided on the side of the partial barrel and closed when the first partial barrel is driven to the non-photographing state position, and the first partial barrel is in the non-photographing state. a lens barrier opening and closing means which is configured so as to open the lens barrier when started to be driven to the object field side from a position, was closed, change at least focal distance
Occasionally, the said first section held by the second portion barrel to
The focusing lens barrel and the second lens group holding frame are
The first lens group and the second lens when realizing separation
In a position corresponding to the axial distance between the group, the first motor and the front
Serial second and a motor rotation control to the first drive mechanism, the second
Simultaneous movement via the drive mechanism and the third drive mechanism
This has been completely achieved by having a configuration that allows the user to perform the operation.

[0013]

The opening and closing operation of the lens barrier in the taking lens barrel apparatus for a camera according to the present invention is performed as follows. That is, a photographing lens barrel device for a camera having a telescopic composite lens barrel divided into at least three parts, a lens barrel main body, a first partial lens barrel, and a second partial lens barrel, is telescopically extended at the time of shooting. At the use position in the retracted state, and at the time of non-photographing, provided so as to be relatively movable to the storage position in the telescopically shortened state, and at least the first partial lens barrel is moved from the storage position (non-photographing position) to the use position. When the relative movement has begun, the lens barrier of the openable / closable lens barrier means is opened in conjunction with the operation of increasing the relative distance on the optical axis between the first partial barrel and the second partial barrel,
When at least the first partial barrel has relatively moved from its use position to the storage position (non-photographing position), the operation of narrowing the relative distance between the first partial barrel and the second partial barrel on the optical axis is reduced. The lens barrier is forcibly closed in conjunction with it. The first partial barrel and the second partial barrel on the barrel body
To move between the stowed storage position and the use position
, The first lead screw threadably thereto constituting the first driving mechanism
Consists of a first lead nut gear that case, of the first motor
Lead propulsion of the first lead nut gear receiving rotational driving force
The second partial lens barrel is moved by an optical axis with respect to the lens barrel body.
Is moved in a direction, it second lead constituting the second driving mechanism
And a second lead nut gear that is screwed into this.
Second lead nut gear receiving the rotational driving force of the first motor
Of the first partial barrel by the reed propulsion action of the second partial barrel
Simultaneously moved in the same direction as the second portion barrel to, the
A third lead screw constituting the three driving mechanisms, adjust screw to
That consists lead nut, receiving the rotational driving force of the second motor
The first part by the lead propulsion action of the third lead screw
Move the second lens group holding frame in the optical axis direction relative to the lens barrel
It has become.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an illustrated embodiment in which the present invention is applied to a photographing lens barrel device for a camera mounted on a variable focus type camera.

FIG. 1 is a schematic structural view showing a schematic structure of a photographing lens barrel device for a camera according to the present invention, and shows a state where a photographing optical system is extended to a position at the time of photographing.
FIG. 2 is a schematic configuration diagram showing a state in which the photographing optical system has moved from the extended position in FIG. 1 to a storage position. FIG. 3 is a block diagram schematically showing a control system of the photographing lens barrel device.

In each of the drawings, reference numeral 1 denotes a photographing lens barrel device, a front lens unit L1 as a first lens unit having a positive refractive power and a negative lens having a negative refractive power, which are sequentially arranged from the field of view. It is configured as a lens barrel device incorporating a photographing optical system L composed of a rear lens unit L2 as a two lens unit.

In this case, in the illustrated embodiment, the photographing optical system L is constituted, for example, as a rear-focusing type continuously variable magnification optical system or stepwise variable magnification optical system. For example, more specific configurations of the photographing optical system L include the following (1) to (4)
It is designed as described in.

(1) At the time of zooming, the rear lens unit L
In the state accompanied by 2, the front lens unit L1 is moved to the object side from the reference position to a position corresponding to the amount of zooming at that time, and is stopped at that position.

(2) When focusing, the front lens unit L
With 1 kept at the moved position, only the rear lens unit L2 is moved from the moved position to the film surface side.
At this time, the movement amount of the rear lens unit L2 is determined by the axial distance between the two lens units L1 and L2 and the movement amount of the rear lens unit L2 required for focusing according to the amount of zooming at each time. The amount of movement is set in advance as a value to be realized.

(3) When the front lens unit L1 and the rear lens unit L2 are located at positions closest to the film side as shown in FIG. Time), and both lens units L1,
The position at which L2 has moved slightly from this position toward the field is defined as the position of the wide end (shortest focal length), and both lens groups L
In the process of moving the lens 1, L2 from the position of the wide end to the object side while maintaining a predetermined axial distance, a zooming effect of changing from wide (short focal length) to tele (long focal length) is performed. When the front lens unit L1 and the rear lens unit L2 move to the positions shown in FIG. 1, the telephoto end (longest focal length) is reached.

(4) Front lens unit L1 during zooming
The axial distance between the zoom lens and the rear lens unit L2 changes so as to be the widest at the wide end and the narrowest at the telephoto end.

The photographing optical system according to the present embodiment is configured so as to perform the above-described movement to realize the zooming action and the focusing action.

Reference numerals 2 to 4 denote fixed mirrors configured as cylindrical members having a triple structure that can move relative to each other along a photographing optical axis (hereinafter, simply referred to as an "optical axis") O and can expand and contract in a telescopic manner. A barrel, a drive barrel and a base barrel.

In this case, the fixed lens barrel 2 is provided so as to be located closest to the film surface side as the lens barrel main body of the photographing lens barrel device 1, and is driven as a second partial lens barrel. The lens barrel 3 is provided as an intermediate lens barrel so as to be relatively movable in the front-rear direction with respect to the fixed lens barrel 2 inside the fixed lens barrel 2, and a ring frame 3 a described later is provided at a rear end thereof. It is configured to have.

Further, a barrier opening / closing cam 3b as a fixed cam portion having an inclined cam surface 3c facing the field is formed on the inner peripheral portion of the ring frame 3a. The barrier opening / closing cam 3b will be described in detail in the section of the lens barrier mechanism 110.

A base lens barrel 4 as a first partial lens barrel
Is provided so as to be relatively movable in the front-rear direction with respect to the drive lens barrel 3 inside the drive lens barrel 3 as the foremost lens barrel. Further, a barrier drive shaft fitting for supporting a later-described barrier drive shaft 111 of a lens barrier mechanism 110 so as to be rotatable and not to be moved in the optical axis O direction is fitted to the rear end wall on the rear side of the base barrel 4. A hole 4a is formed.

Reference numeral 5 denotes a front group frame for holding the front lens group L1, which is fixedly mounted inside the base lens barrel 4 on the field side.

Reference numeral 6 denotes a rear group frame as a movable lens group holding frame for holding the rear group lens group L2, which is provided inside the base lens barrel 4 on the film surface side so as to be able to move straight back and forth along the optical axis O. ing. That is, the front group frame 5 (the base barrel 4)
And the rear group frame 6 are configured as a lens holding frame having a structure in which the on-axis interval can be changed.

A mechanism for guiding the drive barrel 3 in the fixed barrel 2 in a straight line, a mechanism for guiding the base barrel 4 in the drive barrel 3 in a straight line, and a rear group frame in the base barrel 4. As a mechanism for linearly guiding the guide 6, a suitable linear guide mechanism known per se, for example, a linear guide mechanism using a pole member and a slide member (both not shown) is used.

Reference numeral 10 denotes a reversible rotary first motor for driving the driving lens barrel 3 and the base lens barrel 4 in the front-rear direction along the optical axis O. For example, a DC motor having a core is provided inside the fixed lens barrel 2. It is provided at an appropriate location and has a general control unit 1 described later.
03 is digitally controlled. In this case, when the first motor 10 rotates in the forward direction, the driving lens barrel 3 and the base lens barrel 4 move to the subject side, and when the first motor 10 rotates in the reverse direction, they move to the film surface side.

Reference numeral 11 denotes a first drive gear fixedly attached to the output shaft of the first motor 10.

Reference numeral 12 denotes a drive shaft (hereinafter referred to as a "small determination surface drive shaft") provided rotatably in parallel with the optical axis O, for example, in the lower side of the fixed lens barrel 2, and is orthogonal to its longitudinal direction. The cross-sectional shape of the cylinder is 2
It is formed in an almost oval shape with parts cut in parallel planes.

Reference numeral 13 denotes a first driven gear fixedly attached to the rear end (the end on the film surface side) of the small judgment surface drive shaft 12.

Reference numeral 14 denotes a drive transmission gear having a fitting hole (hereinafter, referred to as a "small judgment surface hole") having the same opening shape as the cross-sectional shape of the small judgment surface drive shaft 12. By cooperating with the cross-sectional shape of the surface drive shaft 12, the surface drive shaft 12 is configured to be connected to the small judgment surface drive shaft 12 so as to be integrally rotatable and relatively movable in the optical axis direction.

The drive transmission gear 14 is rotatably provided at a peripheral portion of the drive lens barrel 3 on the ring frame 3a, and is further provided with a gear holding member 15 provided on the ring frame 3a. It is configured so that it cannot move in the direction. The drive transmission gear 14 is configured to mesh with the first lead nut gear 16 and also mesh with the second lead nut gear 17 via an intermediate gear (not shown) as described later.

The first lead nut gear 16 is a gear having a female lead screw which can be screwed with a fixed lead screw 19 described later on the inner peripheral surface thereof. 3 is rotatably provided in a peripheral portion on the ring frame 3a, and like the drive transmission gear 14, the gear holding member 1 provided on the ring frame 3a.
5, so that it cannot move in the optical axis direction.

Therefore, when the small judgment surface drive shaft 12 is rotated in the forward / reverse direction, the first lead nut gear 16
Rotates on the ring frame 3a of the drive lens barrel 3, and the first lead
Due to the lead action of the fixed lead screw 19 as a screw, the drive lens barrel 3 including the ring frame 3a is moved straight forward and backward along the optical axis O. It should be noted that the drive described above
Active shaft 12 , drive transmission gear 14, first lead nut gear 1
6 and the like are collectively referred to as a first drive mechanism.

The second lead nut gear 17 has a movable lead screw 20 as a second lead screw described later on the inner peripheral surface.
A second lead nut gear having a female lead screw that can be screwed with the first lead nut gear 16 on the ring frame 3a of the drive lens barrel 3 so as to be rotatable by itself. In addition, it is configured such that it cannot be moved in the optical axis direction by another gear holding member 15 'provided on the ring frame 3a. In this case, the second lead nut gear 17 is configured to mesh with the drive transmission gear 14 via an appropriate gear train (not shown). The moving the lead screw 20, the second lead described above
Collectively refer to the nut gear 17 and the like as the second drive mechanism
And

Therefore, when the small determination surface drive shaft 12 is rotated in the forward and reverse directions, the second lead nut gear 17
Rotates on the ring frame 3a of the drive barrel 3, and moves the base barrel 4 including the movable lead screw 20 in the front-rear direction along the optical axis O by the lead action of the movable lead screw 20 described later. Will be.

The direction of the lead propulsion generated between the fixed lead screw 19 and the first lead nut gear 16 is as follows.
And the moving lead screw 20 and the second lead nut gear 1
When the first motor 10 rotates in the forward direction, the direction of the lead propulsion action generated between the
It is assumed that the direction is set in advance so that the base lens barrel 4 moves straight in the direction of the object field.

Reference numeral 21 denotes a reversible rotary second motor for driving the rear group frame 6 in the front-rear direction along the optical axis O. As in the case of the above-described first motor 10, for example, a D having a core is provided.
A C motor is provided at an appropriate position in the base barrel 4,
It is configured to be digitally controlled by a general control unit 103 described later. In this case, when the second motor 21 rotates in the forward direction, the rear group frame 6 moves in the base lens barrel 4 in the film surface direction.

Reference numeral 22 denotes a second drive gear fixedly attached to the output shaft of the second motor 21.

Reference numeral 23 denotes a rear group lead screw rotatably provided below the inside of the base lens barrel 4. A second driven gear 24 meshing with the second drive gear 22 is provided at the end on the object field side. Fixedly attached.

Reference numeral 25 denotes a rear group lead nut which is screwed with the rear group lead screw 23 as the third lead screw.
One different from the case of the lead nut gear 16 and 17 second
It is fixedly provided on the rear group frame 6 as a two-lens group holding frame . Therefore, when the rear group lead screw 23 rotates, the rear group lead screw 23 moves together with the rear group frame 6 in the front-rear direction along the optical axis O. The rear group lead screw 23 described above is used.
And rear group lead nut 25, second drive gear 22, second driven
The gear 24 and the like are collectively referred to as a third drive mechanism.
You.

In this case, the direction of the lead propulsion action generated between the rear group lead screw 23 and the rear group lead nut 25 is such that when the second motor 21 rotates forward, the rear group frame 6 The direction is set in advance so as to move straight.

The fixed lead screws 19 screwed together
Between the moving lead screw 2 and the first lead nut gear 16
0 and the second lead nut gear 17, between the rear group lead screw 23 and the rear group lead nut 25, and between the gears meshing with each other, mechanical feed such as screw play or mesh play or backlash. Since play is likely to occur, the screwing accuracy and the meshing accuracy of the respective members should be maintained as good as possible.

Reference numerals 26 and 27 denote the first motor 10 described above.
Rotation speed or rotation angle (hereinafter collectively referred to as "rotation speed")
A first digital signal generating means provided in the fixed lens barrel 2 so that the first motor 1 can be detected as a digital signal.
It comprises a first rotary encoder 26 fixedly attached to the output shaft 0, and a first photo interrupter 27 combined with the first encoder 26.

Reference numerals 28 and 29 denote the second motor 21
A second rotary encoder 28 fixedly attached to the output shaft of the second motor 21 by second digital signal generating means provided in the base barrel 4 so that the rotation speed of the second motor 21 can be detected as a digital signal. , This second encoder 2
8 and a second photointerrupter 29 combined with the second photointerrupter 29.

These two digital signal generating means 26,
The rotation speeds of the first and second motors 10 and 21 detected by 27, 28, and 29 are all output to the general control unit 103 as digital signal count values.

Reference numerals 31 and 32 denote front lens group position detecting means for detecting the moving position of the front lens unit L1 on the optical axis O at the time of zooming as an electric signal. A first sliding contact piece 31 cantileverly mounted via an appropriate insulating material and an electric signal generating member 32 provided on the inner peripheral surface of the fixed lens barrel 2 via an appropriate insulating material. It is configured.

In this case, the electric signal generating member 32 is formed as a plate-like electric resistor elongated in the front-rear direction, for example, along the optical axis O, and the driving lens barrel 3 and the base lens barrel 4 are used for zooming. Is moved in the front-rear direction, the moving position of the drive barrel 3 at that time is defined as an electric resistance value corresponding to the moving amount of the first sliding contact piece 31 from the reference position on the plate-shaped electric resistor 32. The front lens unit L1
Is configured to be able to be output to the general control unit 103 as the movement position information.

Reference numerals 41 and 42 denote rear lens group position detecting means for detecting, as an electric signal, the movement position of the rear lens group L2 on the optical axis O at the time of focusing. A second sliding contact piece 41 mounted in a cantilever manner via a suitable insulating material 7, and an electric signal generating member 42 provided on the inner peripheral surface of the base barrel 4 via a suitable insulating material 7 It is composed of

In this case, similarly to the front lens group position detecting means 31 and 32 described above, the electric signal generating member 42 is a plate-like electric resistor elongated in the front-rear direction, for example, along the optical axis O. When focusing, the rear group frame 6
Is moved in the front-rear direction in the base lens barrel 4, the moving position of the rear group frame 6 at that time is determined by moving the second sliding contact piece 41 from the reference position on the plate-like electric signal generating member 42. It is configured to detect as an electric resistance value corresponding to the moving amount, and to output the detected value to the general control unit 103 as moving position information of the rear lens unit L2.

In FIG. 3, reference numeral 101 denotes an automatic distance measuring means (hereinafter, referred to as "AF means") provided with, for example, an infrared light projection type distance measuring circuit, which detects a photographing distance at each focal length. The detected photographing distance information can be converted into an electric signal and output to the general control unit 103.

Reference numeral 102 denotes a zooming operation means which is operated at the time of zooming and storage. For example, a W → T operating member 102a for moving the photographing optical system L from the wide side to the telephoto side and a T for moving the imaging optical system L from the telephoto side to the wide side. → It is configured to have the W operation member 102b.

In this case, when the W → T operating member 102a is operated, both the first motor 10 and the second motor 21 rotate in the forward direction, and when the T → W operating member 102b is operated, the first motor 10 and the second motor 21 are operated. Are configured to be able to output an operation command such that both rotate in the opposite direction to the general control unit 103 described later.

By operating the zooming operation means 102, an appropriately configured zooming finder device (not shown) can change its photographing field of view in a relationship corresponding to the focal length at each time. In advance.

Reference numeral 103 denotes a general control unit 103 which controls the entire control of the photographing lens barrel apparatus 1.
The following execution control is also performed.

That is, the first motor 10 and the second motor 21 are configured to execute the following controls 1) to 4).

1) The amount of movement of the front lens unit L1 corresponding to the focal length at that time and the front lens unit L at that time
The rotation speed and the direction of the first motor 10 and the second motor 21 corresponding to the value of the on-axis interval between the first lens unit 1 and the rear lens unit L2 are set. The first motor 10 and the second motor 21 are driven in the directions described above.

2) Based on the photographing distance information from the AF means 101, the respective amount of focusing at each focal length is calculated, and the rotation speed and direction of the second motor 21 corresponding to the amount of focusing are set. , Based on the operation command of the variable power operation means 102, the rotation speed and direction of the second motor 2
1 is driven.

3) When the photographing lens barrel device 1 is stored, the number of rotations and direction of the front lens unit L1 and the rear lens unit L2 during storage are set, and based on an operation command of the zoom operation unit 102. , The number of rotations and the direction of the first motor 1
0 and the second motor 21 are driven.

4) First digital signal generating means 26, 2
7 and the outputs of the second digital signal generating means 28 and 29,
In addition, using the outputs of the front lens group position detecting means 31 and 32 and the rear lens group position detecting means 41 and 42, the rotation speed, the moving position, and the stop time of the first motor 10 and the second motor 21 are determined. .

The general control section 103 is configured to execute the above-described control.

In FIG. 4, reference numeral 110 denotes a lens barrier mechanism incorporated in the photographing lens barrel device 1.

Reference numeral 111 denotes a barrier drive shaft rotatably supported by the above-described barrier drive shaft fitting hole 4a of the base barrel 4, which is provided so that its longitudinal direction is parallel to the optical axis O. Is arranged so that it cannot move in the optical axis O direction.

That is, the barrier drive shaft 111 moves together in the same direction when the base barrel 4 moves in the front-back direction along the optical axis O, but freely moves with respect to the base barrel 4 when necessary. It is provided in such a state as to be able to rotate.

Reference numeral 112 denotes an opening / closing drive lever formed at the end of the barrier drive shaft 111 on the film surface side. When the base lens barrel 4 moves to the film surface side, at the end of the movement (for example, at the position of the wide end). It is provided at a position where it can be engaged with the barrier opening / closing cam 3b of the driving lens barrel 3 described above. Then, after the engagement, the inclined cam surface 3c is configured to be rotated clockwise in FIG. 4 by the cam action.

Reference numeral 113 denotes an intermediate lever formed at the end of the barrier drive shaft 111 on the object field side, and has an interlocking pin 114 at the end as shown in FIG.

The interlocking pin 114 is provided so as to fit into an interlocking groove 117c of an intermediary lever 117 described later, and the opening / closing drive lever 112 is rotated clockwise by the cam action of the inclined cam surface 3c. Sometimes Figure 4
5 and can be rotated clockwise in FIG.

Reference numeral 115 denotes a lens barrier formed in such a shape as to block the entire front surface of the front lens unit L1, and a support shaft 116 provided substantially parallel to the optical axis O.
Thus, it is provided so as to be rotatable within a range between an open position (a solid line position in FIGS. 4 and 5) and a shielding position (a dotted line position in FIGS. 4 and 5).

The reference numeral 115a denotes the lens barrier 115.
An open position stopper for setting the open position of
It is planted at an appropriate position in the base lens barrel 4.

The intermediate lever 117 is provided in a space between the support shaft 116 and the barrier drive shaft 111 and outside the photographing optical path. the other end 12 of Lee ya spring 120
0b, and a second rising portion 117b that locks the other end 122b of the connecting spring 122, which will be described later, and is located to the left of these rising portions 117a, 117b. The area to
The arc-shaped interlocking groove 11 into which the interlocking pin 114 is fitted.
7c is formed.

Reference numeral 118 denotes one end of which is a lens barrier 115.
And a link lever substantially integrated with the intermediate lever 117 with an appropriate link pin 119 at the other end.
Is configured to be rotatably connected to the other end.

The barrier spring 120 is for opening the lens barrier 115, and is provided so as to wind the barrier drive shaft 111. The barrier spring 120 is formed and wound so as to have a biasing force (counterclockwise) for moving the intermediary lever 117 to the right, and one end 120 a of the barrier spring 120 is provided in the base barrel 4. It is locked by a locking pin 121 implanted at an appropriate position, and the other end 120b is stretched so as to be locked by the first rising portion 117a of the intermediate lever 117.

Reference numeral 122 denotes a connection spring provided around the barrier drive shaft 111 similarly to the barrier spring 120. The connection pin 114 and the intermediate lever 117 described above.
End 122a is locked on the outer peripheral surface on the left side of the interlocking pin 114, and the other end 122b is locked on the second rising portion 117b of the intermediate lever 117 so as to urge each other. It is stretched to be.

That is, the right outer peripheral surface of the interlocking pin 114 and the right inner peripheral end surface of the interlocking groove 117c of the intermediate lever 117 are extended in a direction in which they are pressed against each other. Therefore, the interlocking pin 114 and the mediating lever 117 come into contact with each other in such a manner that they are attracted to each other by the urging force of the connection spring 122.

Next, the operation or operation for zooming and focusing in the illustrated embodiment configured as described above will be described.

In the illustrated embodiment, when the camera or the photographing lens barrel device 1 is in a non-photographing state or a non-use state, each of the lens barrels 2 to 4 is telescopically shortened as shown in FIG. It will be placed in the used non-use state (storage state).

That is, in this state, the rear group frame 6 completely enters the base lens barrel 4, the base lens barrel 4 also completely enters the drive lens barrel 3, and the drive lens barrel 3 further moves to the fixed lens barrel 2. And completely enters the inside as shown in FIG.

At this time, as described later, the opening / closing drive lever 112 of the barrier drive shaft 111 is moved to the drive lens barrel 3.
Is engaged with the barrier opening / closing cam 3b and receives the cam action of the inclined cam surface 3c.
Moves clockwise against the counterclockwise urging force of the barrier spring 120 applied to itself via the mediating lever 117, the connecting spring 122, and the interlocking pin 114 (hereinafter referred to as “interlocking pin 114 etc.”). It is rotated, and the posture pressed by the inclined cam surface 3c is kept as it is.

Accordingly, the interlocking pin 11 of the intermediate lever 113
4, the interlocking groove 117b of the intermediate lever 117
At this time, an urging force is generated between one end 122a and the other end 122b of the connection spring 122, and the other end 1 of the connection spring 122
22b is in a state of pressing the second rising portion 117b of the mediation lever 117, so that the mediation lever 117 is moved leftward by this pressing force.

When the intermediate lever 117 moves to the left, this moving force is transmitted to the lens barrier 115 via the link lever 118, so that the lens barrier 115 is moved to the solid line position (open position) shown in FIGS. To the dotted line position (shielding position) for protecting the photographing optical system L from external force, and stays at the position after this rotation.

That is, the lens barrier 115 is in a state of blocking the space in front of the front lens unit L1 and is kept as it is.

In this state, when the W → T operating member 102a of the magnification changing operation means 102 is operated, the first motor 10
Rotates in the forward direction, and transmits its rotational driving force to the first lead nut gear 16 via the first drive gear 11 → first driven gear 13 → small decision surface drive shaft 12 → drive transmission gear 14. Further, the power is transmitted to the second lead nut gear 17 via a gear train (not shown).

In this case, the first lead nut gear 16 having received the rotational driving force from the first motor 10 moves straight from the position shown in FIG. To move the driving lens barrel 3 relatively to the fixed lens barrel 2 to a position where the focal length at the wide end can be realized.

Further, the second lead nut gear 17 receiving the rotational driving force from the first motor 10 rotates on the ring frame 3a of the driving lens barrel 3 in the process of moving to the object side, and Since the rotational driving force from the motor 10 is transmitted to the moving lead screw 20, the moving lead screw 20 moves straight from the position shown in FIG. 4 is relatively moved with respect to the drive lens barrel 3 to a position where the focal length at the wide end can be realized.

Further, at this time, the general control section 103
Moves the rear lens group frame 6 (the rear lens group L2) from the retracted position to the wide end position in parallel with the movement control of the drive lens barrel 3 and the base lens barrel 4 toward the object field. The second motor 21 rotates in the forward direction by the number of rotations required to move the rear group frame 6 from the retracted position to the wide end position, and reduces its rotational driving force to the second Drive gear 22
→ Second driven gear 24 → Transmission to rear group lead nut 25 via rear group lead screw 23.

Therefore, the rear group frame 6 holding the rear group lead nut 25 moves rectilinearly from the position shown in FIG. This results in a position where a focal length at the wide end can be realized.

When the driving lens barrel 3 and the base lens barrel 4 are simultaneously moved to a position where the focal length at the wide end is realized, the opening / closing driving lever 112 of the barrier driving shaft 111 and the driving mirror are moved in the moving process. Barrier opening / closing cam 3 of body 3
The engagement with b is released.

Therefore, the three members of the barrier drive shaft 111, the intermediate lever 113, and the interlocking pin 114 exert the urging force of the barrier spring 120 applied to the barrier drive shaft 111 via the first rising portion 117a of the intermediate lever 117. , Via the interlocking pin 114 and the second rising portion 117b of the mediation lever 117.

In this rotating process, the linking pin 114 on the intermediate lever 113 presses the right inner peripheral end face of the linking groove 117b by the connecting spring 122, and
Since the first rising portion 117a is pressed by the other end portion 120b of the barrier spring 120 to move the intermediate lever 117 rightward and further rotate the link lever 118 clockwise through the link pin 119, the lens barrier 1
4 rotates clockwise from the dotted line position (blocking position) in FIGS. 4 and 5 to the solid line position (open position), and stops in a state of contact with the open position stopper 115a. .

That is, when the photographing optical system L has finished moving to the position at the wide end, the lens barrier 115 shifts to the open state and becomes in a photographable state.

In this state, if the operation of the W → T operating member 102a is further continued while observing the variable magnification finder device, the drive lens barrel 3 and the base lens barrel 4 change toward the field. Double time movement will be performed.

However, the operation of moving the drive lens barrel 3 and the base lens barrel 4 at this time is exactly the same as the operation of moving the two lens barrels 3 and 4 from the retracted position to the wide end position. In order to avoid complication, the description is omitted.

By the way, the driving barrel 3 and the base barrel 4
When moving from the storage position to the wide end position,
As described above, the integrated control unit 103 controls the movement of the rear group frame 6 in parallel with the movement control of the two lens barrels 3 and 4.

In the illustrated embodiment, however, the method of controlling the movement of the rear group frame 6 at this time is different from the method of controlling the movement of the rear group frame 6 during the magnification operation. That is, in the illustrated embodiment, when the three lens barrels 2 to 4 are shortened in a telescopic manner, the rear group frame 6 is shortened so as not to protrude from the rear end edge of the base lens barrel 4 toward the film surface side. This is due to the fact that the structure is simple.

In the embodiment shown, three lens barrels 2 to 2 are provided.
In order to shorten the zoom lens 4, first, the rear group frame 6 is moved in the direction of the object field from a position for realizing the focal length at the wide end to a position where the rear lens frame 6 can be completely immersed in the base lens barrel 4. In order to move the driving lens barrel 3 and the base lens barrel 4 from the retracted position to the wide end position during photographing, the second lens barrel is configured to move the base lens barrel 4 to the retracted position. The motor 2 is driven to rotate in the forward direction and the rear group frame 6 is rotated.
Is moved toward the film surface side, and once the axial distance between the front lens unit L1 and the rear lens unit L2 needs to be reset to the widest distance necessary for realizing the focal length at the wide end. Because there was.

However, when the rear group frame 6 has finished moving to the position for realizing the focal length at the wide end, the rear group frame 6 is moved in one direction (object direction) from this position to the tele end position. What is necessary is just to perform the zooming operation.

Therefore, when moving the drive lens barrel 3 and the base lens barrel 4 from the position at the wide end to the position at the telephoto end (magnification), the general controller 103 controls the first motor 10
Is configured to control the rotation of the second motor 2 in the reverse direction while controlling the rotation of the second motor 2 in the forward direction.

In other words, in the control at the time of zooming, the general control unit 103 controls the first motor 10 to change the amount of movement corresponding to the amount of movement of the drive lens barrel 3 and the base lens barrel 4 (front lens unit L1). running multiple control for rotating only in the positive direction speed during and for the second motor 21, in parallel to this
For rotating the total by the rotation speed reverse the rotational speed of the in-focus state in accordance with the rotational speed of the zooming corresponding to the amount of movement of the drive Dokyodo 3 and the base barrel 4 and the photographing distance at that time Execute control.

Accordingly, the drive lens barrel 3, the base lens barrel 4, and the rear group frame 6 all move toward the object field, and move the front lens group L1 to a position where the focal length at that time can be realized. ,
At the same time, the rear lens unit L2 is moved to a position where an axial distance between the two lens units L1 and L2 realizing the focal length at that time and a focusing amount according to the shooting distance at that time can be realized. .

In this case, the respective rotation speeds of the first motor 10 and the second motor 21 are detected by the first digital signal generators 26 and 27 and the second digital signal generators 28 and 29 each time, and are integrated. The moving position of the driving lens barrel 3 (which is also the base lens barrel 4) and the rear group frame 6 from the reference position at this time are fed back to the control unit 103, and the front lens group position detecting means 31,
32 and the feedback by the rear lens group position detecting means 41 and 42 to the general control unit 103, the general control unit 103 controls the first motor 10 and the second motor 21 based on these detection values. It will be precisely controlled.

When the desired focal length (magnification) is obtained in this manner, the operation of the W → T operating member 102a is interrupted, and a normal photographing sequence is executed by pressing a shutter release operating member (not shown). .

On the other hand, when the focal length is changed from the telephoto side to the wide side, this is performed by operating the T → W operation member 102b of the zoom operation means 102.

In this case, the first motor 10
The second motor 21 rotates in the forward direction, and the movement of the drive lens barrel 3 and the rear group frame 6 by the motors 10 and 21 at this time is as follows. This is only the reverse of the case where the magnification is changed from the wide side to the tele side, and the description thereof will be omitted to avoid complication.

In the illustrated embodiment, in any case, the movement amount (magnification amount) of the drive lens barrel 3 and the rear group frame 6 from the reference position is set by the user using the W of the magnification operation means 102. → T operating member 102a and T → W operating member 102b
Will be performed depending on the length of time for operating.

Next, the operation or operation when the photographing lens barrel device 1 is shifted to the housed state will be described.

The operation in this case is performed by the T → W operating member 102.
This is performed as an extension of the zooming operation from the tele side to the wide side by b. That is, the T → W operating member 1
When the user operates 02b, in the region from the telephoto end to the wide end, the first motor 10 rotates in the reverse direction and the second motor 21 rotates in the forward direction, respectively, so that the drive lens barrel 3, the base lens barrel 4, and the rear group frame are rotated. 6 are respectively moved toward the film surface side.

Then, in the region from the wide end position to the storage position, both the first motor 10 and the second motor 21 rotate in opposite directions, and the first motor 10 is driven by the drive lens barrel 3 and the base lens barrel 4. Is moved toward the film surface side, and the second motor 21 moves the rear group frame 6 toward the object field side, and the three lens barrels 2 to 4 are triple-mounted in a telescopic manner as shown in FIG. Position.

At this time, during the final movement of the base barrel 4, the opening / closing drive lever 11 of the lens barrier mechanism 110 is moved.
2 is engaged with the barrier opening / closing cam 3b of the drive lens barrel 3, and is forcibly rotated clockwise by the cam action of the inclined cam surface 3c, and accordingly, is substantially integrated with the opening / closing drive lever 112. The barrier drive shaft 111, the intermediate lever 113, and the interlocking pin 114 also rotate clockwise.

At this time, the interlocking pin 114 and the intermediate lever 1
The intermediate lever 117 is pressed to the left by the pinching action of the connection spring 122 with the second rising portion 117b of the first lever 17 and the intermediate lever 117 moves to the left, and the link lever 118 moves through the link pin 119.
Is rotated counterclockwise about the support shaft 116 as a rotation center.

Therefore, the lens barrier 115 substantially integrated with the link lever 118 also rotates counterclockwise from the solid line position (open position) to the dotted line position (shield position) in FIGS. 4 and 5 and stops at this position. Will do. That is, the lens barrier 115 blocks the space in front of the front lens unit L1.

This state continues as long as the opening / closing drive lever 112 is in contact with the barrier opening / closing cam 3b of the drive lens barrel 3. Therefore, the lens barrier 115 remains in the state where the photographing lens barrel device 1 is in a shortened state. Thus, it is possible to protect the photographic light beam entrance aperture of the photographic optical system L from external force.

Although the embodiment has been described above, the present invention is not limited to this embodiment, and it should be noted that various modifications can be made without departing from the scope of the invention.

For example, in the illustrated embodiment, each of the front lens group position detecting means 31 and 32 and the rear lens group position detecting means 41 and 42 is configured as a potentiometer using a plate-shaped electric resistor. This can also be configured as follows.

That is, a plurality of strip-shaped plates made of an appropriate conductor are arranged in parallel at substantially equal intervals along the optical axis on an insulating substrate to form a conductor pattern. Instead of the plate-shaped electric resistor of the embodiment, it is attached to the fixed lens barrel 2 and the base lens barrel 4 so that the respective sliding contact pieces 31 and 41 can scan the conductor pattern.

When the drive lens barrel 3 and the rear group frame 6 move on the optical axis, the respective sliding contact pieces 31 and 41 move.
Detects the moving position of the drive lens barrel 3 and the rear group frame 6 using on / off signals generated by successive contact with the strip-shaped plates on each conductor pattern.

For example, the on-axis positions of the front lens unit L1 and the rear lens unit L2 corresponding to each focal length at infinity are determined by the number of pulses from the generation point of the on / off signal of each strip plate. Pre-set at the time of optical design as
First, the number of ON / OFF signals of the strip-shaped plate is counted, and the approximate movement positions of the front lens unit L1 and the rear lens unit L2 are detected. By moving the front lens unit L1 and the rear lens unit L2 by a number, the final movement position of the front lens unit L1 and the rear lens unit L2 can be detected.

In this case, if a stepwise magnification method is adopted as the magnification method of the photographing optical system, the control method is simplified.

Also, in the case of detecting each focusing position at each focal length, the expected focusing amount is set in several steps using, for example, the depth of focus effect, and is set. The final focusing position may be detected by using a technique for detecting the focal length.

In the illustrated embodiment, when the photographing lens barrel device shifts from the non-photographing state or the non-use state to the housed state, the driving lens barrel 3 and the base lens barrel 4 are simultaneously moved to the fixed lens barrel 2. It is configured such that the driving lens barrel 3 is first accommodated in the fixed lens barrel 2 and then the base lens barrel 4 is accommodated in the driving lens barrel 3 and vice versa. Alternatively, the base lens barrel 4 may be housed in the drive lens barrel 3 and then the drive lens barrel 3 may be housed in the fixed lens barrel 2.

In the illustrated embodiment, the photographing optical system is configured as a variable focus type optical system. However, it may be configured as a single focal length photographing optical system.

Although the illustrated embodiment employs a lens barrier mechanism having one lens barrier, the present invention is also applicable to, for example, a lens barrier mechanism having two lens barriers that open in opposite directions. I can do it.

In the illustrated embodiment, two partial lens barrels, the driving lens barrel 3 and the base lens barrel 4, are housed in the fixed lens barrel 2. However, three or more partial lens barrels are fixed. The present invention is also applicable to a photographing lens barrel device configured to be housed in the barrel 2.

[0126]

As described above, according to the present invention, the present invention, a lens barrel portion of the photographic lens barrel apparatus for cameras, part barrel located in at least two parts barrel (top may stretch the telescopic and partial barrel) and barrel body portion located in the middle (or, that are configured as a composite barrel telescopic consisting camera), the second partial mirror barrel of the two parts barrel, For the first lead screw that constitutes the first drive mechanism
The first lead nut gear to be screwed is rotated by the first motor.
The mirror is driven by the lead propulsion when rotating under power.
The first part is configured to be movable relative to the trunk body.
Screw the lens barrel onto the second lead screw that constitutes the second drive mechanism
The second lead nut gear is rotated by the first motor.
The lead propulsion action when rotating with power
It is configured to be relatively movable with respect to the two lens barrels, and
The partial barrel located at the top (in the example shown, the first partial barrel)
Can be housed in the internal space of the partial barrel located in the middle (in the illustrated example, the second partial barrel), and the lens barrel body is housed in its own internal space. A first drive mechanism and a second drive mechanism
Accordingly, the use position in a state of being extended in telescopic during shooting, also, that are configured to be driven relative respective storage position in a state of being reduced to telescopically when not in photographing, or the various Configured with conditions
The two partial lens barrels with a helicoid screw mechanism and
Like the conventional device driven by the cam drive mechanism,
Is complicated and difficult to manufacture
Processing and processing without skill.
Is easy to assemble and therefore can be reduced in cost.
Low power, can be driven by small capacity motor, 3
The lens barrel member composed of
The amount of elongation can be increased by reducing the size
Despite being able to expand, the lens barrel body
Can be stored in the unit, and therefore a large
Ru can provide photographic lens barrel apparatus for a camera having a lens barrier can realize transfected reduction. Further, the first partial lens barrel is provided with an opening / closing lens barrier means capable of shielding an imaging light beam entrance opening of the imaging optical system from the outside. Installed on a two-part barrel, with at least the first part barrel in its stowed position (non-photographing state)
When it is started to be driven to the object field side, the lens barrier of the openable / closeable lens barrier means is opened in conjunction with the operation of increasing the relative distance on the optical axis between the first partial barrel and the second partial barrel, When at least the first partial barrel has relatively moved from its use position (the state at the time of photographing) to the storage position, the relative distance on the optical axis between the first partial barrel and the second partial barrel is reduced. are configured to in conjunction may closes the lens barrier forced to work from, the lens barrier opens
Special drive system for closing or manual opening / closing
The opening and closing mechanism of the lens barrier is simple
A section for holding the first lens group and the second lens group
No adverse effect on the maintenance of accuracy
Multiple lens barrels with a helicoid lens barrel or cam ring
A space for disposing the lens barrier opening / closing mechanism is easier than that of a camera, and a photographic lens barrel device for a camera having a lens barrier that can be configured to have a robust barrier opening / closing means can be provided. Further, the lens barrier closing means, prior
A serial provided in the second partial mirror barrel side the stationary cam portion, this
At the end of the movement of the fixed cam section and the first partial barrel.
And the barrier driving shaft of the opening and closing lever integral pivoting Te, and an intermediate lever which rotates integrally with the barrier drive shaft, and intermediary lever for opening and closing the lens barrier via a link lever, the intermediate lever and the intermediary lever interposed between,
In either the opening direction or the closing direction of the intermediate lever
Also, a connection switch that elastically transmits a force to the intermediate lever.
And pulling, constantly lens barrier to the mediation lever
A buyer spring biasing in the opening direction, or constructed from
When opening and closing the lens barrier,
Excessive force acts on the rear drive mechanism and lens group holding frame, etc.
And the lens barrier is securely closed when stored
Be sure to open the lens barrier at the beginning of
It is easy to use, easy to use and reliable.
Hisage the photographic lens barrel apparatus for a camera with a Nzubariya
Can be offered.

Therefore, according to the present invention, it is possible to achieve cost reduction, space saving and compactness as compared with this type of conventional device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a configuration of a taking lens barrel device for a camera including a lens barrier according to the present invention, showing a state where a taking optical system is extended to a position at the time of taking a picture.

FIG. 2 is a schematic configuration diagram illustrating a state in which the imaging optical system illustrated in FIG. 1 has been moved from an extended position to a storage position.

FIG. 3 is a block diagram schematically showing a control system of the photographing lens barrel device for the camera shown in FIG.

FIG. 4 is a perspective view of a lens barrier mechanism provided in the photographing lens barrel device for the camera shown in FIG.

FIG. 5 is a front view of the lens barrier mechanism shown in FIG. 4;

FIG. 6 illustrates a method of stretching a barrier spring and a connection spring stretched between an intermediate lever and a locking pin and between an interlocking pin and an intermediate lever in the lens barrier mechanism shown in FIG. 4; FIG.

[Explanation of symbols]

 L Imaging optical system L1 Front lens group L2 Rear lens group O Imaging optical axis (optical axis) 1 Imaging lens barrel device 2 Fixed lens barrel 3 Drive lens barrel 3a Ring frame 3b Barrier opening / closing cam 3c Inclined cam surface 4 Base Lens barrel 4a Barrier drive shaft fitting hole 5 Front group frame 6 Rear group frame 10 First motor 11 First drive gear 12 Small decision surface drive shaft 13 First driven gear 14 Drive transmission gear 15, 15 'Gear restraining member 16th One lead nut gear 17 Second lead nut gear 19 Fixed lead screw 20 Moving lead screw 21 Second motor 22 Second drive gear 23 Rear group lead screw 24 Second driven gear 25 Rear group lead nut 26 First rotary encoder 27 First One photo interrupter 28 Second rotary encoder 29 Second photo interrupter 31, 32 Front group lens group position detecting means 3 REFERENCE SIGNS LIST 1 first sliding contact piece 32 electric signal generating member (plate-like electric resistor) 41, 42 rear group lens group position detecting means 41 second sliding contact piece 42 electric signal generating member (plate-like electric resistor) 101 Automatic distance measuring means (AF means) 102 Zooming operation means 102a W → T operation member 102b T → W operation member 103 General control unit 110 Lens barrier mechanism 111 Barrier drive shaft 112 Opening / closing drive lever 113 Intermediate lever 114 Interlocking pin 115 Lens barrier 115a Open position stopper 116 Support shaft 117 Intermediate lever 117a First rising portion 117b Second rising portion 117c Interlocking groove 118 Link lever 119 Link pin 120 Barrier spring 121 Locking pin 122 Connection spring

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Terui 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-2-259737 (JP, A) 2-5729 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 11/04 G02B 7/10

Claims (5)

(57) [Claims] 1. An imaging optical system including a first lens group and a second lens group disposed so as to be relatively movable along the same optical axis, and provided so as to be relatively movable along the optical axis. At least in the non-photographing state, one of the two partial barrels configured such that one partial barrel can be housed in the internal space of the other partial barrel, and is located at the forefront and at least the imaging optical system. A first partial lens barrel configured to hold the first lens group of the system in a fixed manner, and between the first partial lens barrel and the lens barrel main body portion of the two partial lens barrels; A second partial barrel provided so as to be able to be housed in the internal space of the barrel main body at least at the time of non-photographing; and the first and second partial barrels being arranged along the optical axis. It is supported so that it can move relatively, and at least in the non-shooting state The first and second partial lens barrels are configured to be able to be housed in their own internal spaces, and the first and second partial lens barrels are provided so as to be relatively movable along the optical axis within the first partial lens barrel.
Is, the second lens for fixedly holding said second lens group
A group holding frame, is provided between said barrel body portion and the second portion barrel
1st lead screw and 1st lead nut gear screwed into this
The first rib receiving the rotational driving force of the first motor.
The lens barrel body is driven by the lead propulsion action of the lead nut gear.
Moving the second partial barrel in the optical axis direction with respect to the part
A drive mechanism, provided between the second portion barrel and said first portion barrel
Second lead screw and the second lead nut
And receiving the rotational driving force of the first motor.
Due to the lead propulsion action of the second lead nut gear,
The first partial barrel is connected to the second partial barrel with respect to the two-part barrel.
Set between the and the second drive mechanism for moving the same direction simultaneously, and the first partial mirror barrel and the second lens group holding frame
It kicked the third lead screw and re-such from the lead nut, the second
The lead of the third lead screw receiving the rotational driving force of the motor.
The second lens is moved with respect to the first partial barrel by the
A third drive mechanism for moving the lens group holding frame in the optical axis direction, which is configured so as to shield the space of the object scene side and the first lens group provided in the first partial mirror inside the body from the outside Opening and closing lens barrier means, provided on the side of the second partial lens barrel, and closing the lens barrier of the lens barrier means when the first partial lens barrel is driven to a non-photographing state position; have a, a lens barrier opening and closing means which is configured so as to open the lens barrier when the first portion barrel began to be driven in the object field side from a state position when the non-shooting, at least a focal length When changing , the second partial mirror
The first partial barrel held by the barrel and the second lens group holder
The above-mentioned first when realizing the focal length with the holding frame
A position corresponding to the axial distance between the lens group and the second lens group.
The location, and rotation control and said second motor and said first motor
Te, wherein the first drive mechanism, second drive mechanism and the third driving
An imaging lens barrel device for a camera including a lens barrier, wherein the imaging lens barrel device is configured to be able to be simultaneously moved via a mechanism . Wherein said first driving mechanism rotating the first motor
A drive shaft for receiving a rotation driving force, fitted on the drive shaft, the axial
Drive that is allowed to slide and rotates integrally with the drive shaft
A transmission gear, a first lead screw which is fixed to the barrel main body, the first Li
Screw with the drive screw and mesh with the drive transmission gear
A first lead nut gear, and the drive transmission gear;
The first lead nut gear is connected to the rear end of the second partial barrel.
A structure disposed in said second drive mechanism, the intermediate rotating force of the drive transmission gear
A second lead nut gear received via a gear, and a front end fixed to the first partial barrel, and a second lead nut gear ;
Has a second lead screw Togia is screwed, the front of the second lead nut gear and the intermediate gear
A serial disposed in the second portion barrel side configuration, the third drive mechanism is rotatably supported on the first portion barrel
A third rib held by the second motor and receiving the rotational driving force from the second motor.
And over de screw, it the third lead is fixed to the third lens group holding frame side
And the third lens group lead nut that is screwed together
Comprising a Renzubari Ya according to claim 1, characterized in that
Lens barrel device for camera. 3. An opening / closing lens barrier means provided in said first partial barrel, wherein said lens barrier is open when in a free state, and is provided on said second partial barrel side. The lens barrier opening / closing means, the lens barrier of the opening / closing lens barrier means or an interlocking member thereof at the end of movement of the first partial barrel when the first partial barrel is driven to a position in a non-photographing state. engaging contact, and, also claim 1, characterized by being configured as a stationary cam structure capable of transition to the closed state from forcibly opened state the lens barrier by the engagement contact operation
3. A photographing lens barrel device for a camera comprising the lens barrier according to 2 . Wherein said lens barrier opening and closing means, the second
It said stationary cam portion provided in a portion barrel side, Kakarise' to move the end of this stationary cam portion and the first portion barrel
And a barrier drive shaft of the opening and closing lever integral to rotate, the intermediate lever rotates integrally with the barrier drive shaft, said
Intermediate lever that opens and closes the lens barrier via a link lever
And over, and wherein the intermediate lever is interposed between an intermediary lever, connecting spring for transmitting the force to elastically the mediation lever for either direction of the opening and closing direction of the intermediate lever, the mediation lever photographing lens barrel apparatus for a camera with a lens barrier according to claim 3, characterized in that to constitute a constant lens barrier and opening direction to urge bar Lee ya spring, from to. Wherein one of the barrier opening and closing means, the fixed
The cam is provided in each of the first lens group and the second lens group.
In the ring frame connected to the second partial barrel that does not hold
Is formed, the barrier driving shaft, said first lens group, the
The first partial mirror, which does not directly hold any of the second lens groups
Held inserted rotatably in a fitting hole formed in the cylinder, the intermediate lever, the mediation lever, the link lever, before
Serial lens barrier, provided in the first partial mirror inside the body
A photographing lens barrel device for a camera, comprising: the lens barrier according to claim 4 .